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Introduction
Hx1 Hybrid
e Telos Hx1 is a single digital hybrid in a 1RU 19 inch rack mount enclosure. It
embodies a state of the art approach to interfacing an analog POTS (Plain Old
Telephone Service) line for broadcast on-air use. e fast, precise digital automatic-
nulling hybrid allows smooth, natural, conversation without speakerphone-like
up-cutting eects, or the audio distortion and feedback problems often experienced
with lesser hybrid interface devices.
e Hx1 implements a number of features in the digital domain in order to enhance
“real-world” performance. In particular, the hybrid includes a sophisticated automatic
gain control in both the send and receive paths, a carefully implemented override
ducking system, a pitch shifter for feedback reduction, and a digital dynamic EQ that
keeps audio spectrally consistent from call to call.
Purpose
e Telos Hx1 or Hx2 broadcast telephone hybrids are designed to deliver pure caller
audio with as little leakage from the (announcer’s) send audio as possible. Telos uses
state of the art digital techniques to perform the hybrid function – the subtraction
of the send audio from the received caller audio. e fully digital approach assures
consistently good trans-hybrid loss, audio levels and sound quality with varying
telephone line conditions.
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